"It's tight," Beltre said. "I went through the workout earlier but didn't run, and before the game I sprinted and it felt tighter, tighter and tighter."
Beltre usually has problems with his hamstring muscles, which are in the back of the leg. The quad muscle is on the front side.
"I'm not used to the front," Beltre said. "I'm used to the back. This is new for me."
Beltre was scheduled to get the day off Friday and will likely not go to Phoenix on Saturday for the Rangers' game against the Athletics. So the earliest he will play is Sunday against the White Sox. He said he is not worried about the injury.
"I didn't run full speed today," Beltre said. "I don't know how it is. I tried not to force it."
T.R. Sullivan is a reporter for MLB.com. Read his blog, Postcards from Elysian Fields, and follow him on Twitter @Sullivan_Ranger. This story was not subject to the approval of Major League Baseball or its clubs.